<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>while语句</title>
        <script>
            //1~100,求和
            var sum=0;
            var num=1;

         while (num<=100){
             sum+=num;
             num++;

         }
         alert(sum)




        </script>



    </head>
    <body>
        
    </body>
</html>